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Glossary of Terms

IBTTA’s transportation Glossary of Terms is an ever-changing list of terms used within the transportation and tolling industry. The Glossary was updated in March, 2016. If you have suggestions for future additions, please contact us.

InterAgency Group. The E-Zpass InterAgency Group is the entity responsible for creating and administering E-Zpass, a collaboration between 21 member agencies on the East Coast of the United States that provides interoperable electronic tolling.

International Bridge, Tunnel and Turnpike Association is the worldwide alliance of toll operators and associated industries that provides a forum for sharing knowledge and ideas to promote and enhance toll-financed and other direct-user-fee-financed transportation services.

Intelligent Cruise Control. Also known as Autonomous Intelligent Cruise Control (AICC) and Adaptive Cruise Control (ACC). Dynamic speed and distance control in relation to the vehicle in front using on-board equipment.

A Service Mark of the U.S. DOT. IntelliDriveSM is a suite of technologies and applications using wireless communications to provide connectivity among all types of vehicles; between vehicles and roadway infrastructure; and among vehicles, infrastructure and wireless consumer devices to improve safety, mobility and environment. http://www.its.dot.gov/presentations/pdf/MW_IntelliDrive_Overview.pdf.

IAG. The E-Zpass InterAgency Group is the entity responsible for creating and administering E-Zpass, a collaboration between 21 member agencies on the east coast of the United States, that provides interoperable electronic tolling.

A cooperative arrangement established between public and/or commercial entities (Authorities, parking lot operators, etc.) wherein tags issued by one entity will be accepted at facilities belonging to all other entities without degradation in service performance.

Intelligent Speed Adaptation. Various concepts aimed at limiting the vehicle speed in relation to different defined speeds (static, variable or dynamic) for certain road sections via various user interfaces (informative, supportive or compulsory). Also known as Automatic Speed Adaptation (ASA).

Internal Service Fund - In government accounting, a fund used to account for goods or services given to one department by another on a cost reimbursement basis. The fund is profit and loss oriented and hence follows accrual accounting.

The organization that is responsible for issuing accounts and Private Keys to be used in the Transponder employed by a User to engage in an electronic payment service. In the US today, the Issuer is generally an Authority, but there are examples where it is a bank or credit card company in Europe. Note that the Issuer often employs a third party Account Processor (Customer ServiceType Center) to process the accounts.

Intelligent Transportation Systems. A broad range of diverse technologies, including information processing, communications, control and electronics, which, when applied to our transportation system, can save time, money and lives.